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Sunday, 2 December 2018

Some Examples of Tactic Responses

Stimulus - Name of Response - Examples

• light - Phototaxis - Euglena and chlamydomonas swim towards light of low intensity (positive Phototaxis) , and away from light of high intensity (negative Phototaxis); earthworm wriggles away from light (negative Phototaxis)

• Chemicals - Chemotaxis - in a moss plant, sperms swim towards the chemicals produced by the egg cell (positive Chemotaxis)

• Temperature - Thermotaxis - Motile bacteria swim from cold regions to warm regions ( positive Thermotaxis)

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